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30.
following criteria: duration (Ld ), pitch (Lc ), existence of dio voiced and unvoiced frames (Lv ), and low-level features repr Note segmentation related to stability (Ls ):‣ Short note transcription: Dynamic programming (DP) algorithm. each L(npi ) = Ld (npi ) · Lc (npi ) · Lv (npi ) · Ls (npi ) (8) are givi ‣ Duration: small for short and long durations Duration likelihood Ld is set so that it is small for short step ‣ Stability: a voiced note should be more or less stable in timbre energy ‣ and long durations. Pitch likelihood L is deﬁned so that it Pitch: more weight to frames with low f0 derivative c base ‣ Voicing: according to the % of voiced frames0 values are to the note nom- is higher the closer the frame f in a note peatnote pitch indexinal pitch cpi , giving more relevance to frames with low f0 F derivative values. The voicing likelihood Lv is deﬁned so node k, j tion that segments with a high percentage of unvoiced frames and are unlikely to be a voiced note, while segments with a temp j high percentage of voiced frames are unlikely to be an un- leve voiced note. Finally, the stability likelihood Ls considers that a voiced note is unlikely to have fast and signiﬁcant 0 0 timbre or energy changes in the middle. Note that this is 4.1 k-dmax k-dmin k frame index not in contradiction with smooth vowel changes, charac- emilia.gomez@upf.edu teristic of ﬂamenco singing. We